/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.plugins.assembly.utils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.resolver.filter.AndArtifactFilter;
import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
import org.apache.maven.plugins.assembly.InvalidAssemblerConfigurationException;
import org.apache.maven.project.MavenProject;
import org.apache.maven.shared.artifact.filter.PatternExcludesArtifactFilter;
import org.apache.maven.shared.artifact.filter.PatternIncludesArtifactFilter;
import org.apache.maven.shared.artifact.filter.StatisticsReportingArtifactFilter;
import org.apache.maven.shared.artifact.filter.resolve.ScopeFilter;
import org.slf4j.Logger;

/**
 *
 */
public final class FilterUtils {

    private FilterUtils() {}

    public static Set<MavenProject> filterProjects(
            final Set<MavenProject> projects,
            final List<String> includes,
            final List<String> excludes,
            final boolean actTransitively,
            final Logger logger) {
        final List<PatternIncludesArtifactFilter> allFilters = new ArrayList<>();

        final AndArtifactFilter filter = new AndArtifactFilter();

        if (!includes.isEmpty()) {
            final PatternIncludesArtifactFilter includeFilter =
                    new PatternIncludesArtifactFilter(includes, actTransitively);

            filter.add(includeFilter);
            allFilters.add(includeFilter);
        }
        if (!excludes.isEmpty()) {
            final PatternExcludesArtifactFilter excludeFilter =
                    new PatternExcludesArtifactFilter(excludes, actTransitively);

            filter.add(excludeFilter);
            allFilters.add(excludeFilter);
        }

        Set<MavenProject> result = new LinkedHashSet<>(projects.size());
        for (MavenProject project : projects) {
            final Artifact artifact = project.getArtifact();

            if (filter.include(artifact)) {
                result.add(project);
            }
        }

        for (final PatternIncludesArtifactFilter f : allFilters) {
            if (f != null) {
                f.reportMissedCriteria(logger);
            }
        }
        return result;
    }

    public static void filterArtifacts(
            final Set<Artifact> artifacts,
            final List<String> includes,
            final List<String> excludes,
            final boolean strictFiltering,
            final boolean actTransitively,
            final Logger logger,
            final ArtifactFilter... additionalFilters)
            throws InvalidAssemblerConfigurationException {
        final List<ArtifactFilter> allFilters = new ArrayList<>();

        final AndArtifactFilter filter = new AndArtifactFilter();

        if (additionalFilters != null) {
            for (final ArtifactFilter additionalFilter : additionalFilters) {
                if (additionalFilter != null) {
                    filter.add(additionalFilter);
                }
            }
        }

        if (!includes.isEmpty()) {
            final ArtifactFilter includeFilter = new PatternIncludesArtifactFilter(includes, actTransitively);

            filter.add(includeFilter);

            allFilters.add(includeFilter);
        }

        if (!excludes.isEmpty()) {
            final ArtifactFilter excludeFilter = new PatternExcludesArtifactFilter(excludes, actTransitively);

            filter.add(excludeFilter);

            allFilters.add(excludeFilter);
        }

        // FIXME: Why is this added twice??
        // if ( additionalFilters != null && !additionalFilters.isEmpty() )
        // {
        // allFilters.addAll( additionalFilters );
        // }

        for (final Iterator<Artifact> it = artifacts.iterator(); it.hasNext(); ) {
            final Artifact artifact = it.next();

            if (!filter.include(artifact)) {
                it.remove();

                if (logger.isDebugEnabled()) {
                    logger.debug(artifact.getId() + " was removed by one or more filters.");
                }
            }
        }

        reportFilteringStatistics(allFilters, logger);

        for (final ArtifactFilter f : allFilters) {
            if (f instanceof StatisticsReportingArtifactFilter) {
                final StatisticsReportingArtifactFilter sFilter = (StatisticsReportingArtifactFilter) f;

                if (strictFiltering && sFilter.hasMissedCriteria()) {
                    throw new InvalidAssemblerConfigurationException(
                            "One or more filters had unmatched criteria. Check debug log for more information.");
                }
            }
        }
    }

    public static void reportFilteringStatistics(final Collection<ArtifactFilter> filters, final Logger logger) {
        for (final ArtifactFilter f : filters) {
            if (f instanceof StatisticsReportingArtifactFilter) {
                final StatisticsReportingArtifactFilter sFilter = (StatisticsReportingArtifactFilter) f;

                if (logger.isDebugEnabled()) {
                    logger.debug("Statistics for " + sFilter + "\n");
                }

                sFilter.reportMissedCriteria(logger);
                sFilter.reportFilteredArtifacts(logger);
            }
        }
    }

    /**
     * Results in a filter including the rootScope and its transitive scopes
     *
     * @param rootScope the root scope
     * @return the filter
     */
    public static ScopeFilter newScopeFilter(final String rootScope) {
        return newScopeFilter(Collections.singleton(rootScope));
    }

    /**
     * Results in a filter including all rootScopes and their transitive scopes
     *
     * @param rootScopes all root scopes
     * @return the filter
     */
    public static ScopeFilter newScopeFilter(final Collection<String> rootScopes) {
        Set<String> scopes = new HashSet<>();

        for (String rootScope : rootScopes) {
            if (Artifact.SCOPE_COMPILE.equals(rootScope)) {
                scopes.addAll(Arrays.asList("compile", "provided", "system"));
            }
            if (Artifact.SCOPE_PROVIDED.equals(rootScope)) {
                scopes.add("provided");
            }
            if (Artifact.SCOPE_RUNTIME.equals(rootScope)) {
                scopes.addAll(Arrays.asList("compile", "runtime"));
            }
            if (Artifact.SCOPE_SYSTEM.equals(rootScope)) {
                scopes.add("system");
            }
            if (Artifact.SCOPE_TEST.equals(rootScope)) {
                scopes.addAll(Arrays.asList("compile", "provided", "runtime", "system", "test"));
            }
        }

        return ScopeFilter.including(scopes);
    }
}
